Download PSI Physics Electro-Magnetic Induction Multiple Choice Questions A

PSI Physics Electro-Magnetic Induction
Multiple Choice Questions
1. A loop of wire is placed in a perpendicular magnetic field.
Suddenly, the magnitude of the magnetic field begins to increase,
what is the direction of the induced current in the loop?
A. Clockwise.
B. Counter-clockwise.
C. Out of the page.
D. Into the page.
E. There is no induced current in the loop.
2. A loop of wire is placed in a perpendicular magnetic field.
Suddenly, the magnitude of the magnetic field begins to increase,
what is the direction of the induced current in the loop?
A. Clockwise.
B. Counter-clockwise.
C. Out of the page.
D. Into the page.
E. There is no induced current in the loop.
3. A loop of wire is placed in a perpendicular magnetic field.
Suddenly, the magnitude of the magnetic field begins to decrease,
what is the direction of the induced current in the loop?
A. Clockwise.
B. Counter-clockwise.
C. Out of the page.
D. Into the page.
E. There is no induced current in the loop.
4. A loop of wire is placed in a perpendicular magnetic field.
Suddenly, the magnitude of the magnetic field begins to decrease,
what is the direction of the induced current in the loop?
A. Clockwise.
B. Counter-clockwise.
C. Out of the page.
D. Into the page.
E. There is no induced current in the loop.
5. A rectangular loop of wire with dimensions 0.2 m x 0.5 m is
placed in a uniform magnetic field of magnitude 2 T. The
magnetic field is perpendicular to the plane of the loop.
What is the magnetic flux in the loop?
A. 0.1 Wb
B. 0.2 Wb
C. 0.3 Wb
D. 0.4 Wb
E. 0.5 Wb
6. A rectangular loop of wire with
dimensions 0.2 m x 0.5 m is
placed in a uniform magnetic
field of magnitude 2 T. The
magnetic field is perpendicular
to the plane of the loop. The
loop is moved from region I to
region II in 0.05 s? What is the
induced emf in the loop?
A. 1 V
B. 2 V
C. 3 V
D. 4 V
E. 5 V
7. A bar magnet is moved towards a vertical conducting ring that is
suspended at the end of a string. What happens to the ring during
the time when the magnet approaches it?
A. The ring will move toward the magnet.
B. The ring will move away from the magnet.
C. The ring will remain stationary.
D. The ring will tend to turn in clockwise direction.
E. The ring will tend to turn in counter-clockwise direction.
8. A bar magnet with the north pole faced downward is held above a horizontal
circular coil. Which of the following statements about the induced current is
true (viewed from above)?
A. The induced current flows in a clockwise direction.
B. The induced current flows in a counter-clockwise direction.
C. The induced current flows first in a clockwise and then in a counterclockwise direction.
D. The induced current flows first in a counter-clockwise and then in a
clockwise direction.
E. There is no induced current in the coil.
9. A bar magnet with the north pole faced downward is dropped above a
horizontal circular coil. Which of the following statements about the induced
current is true (viewed from above)?
A. The induced current flows in a clockwise direction
B. The induced current flows in a counter-clockwise direction
C. The induced current flows first in a clockwise and then in a counter-clockwise
direction
D. The induced current flows first in a counter-clockwise and then in a clockwise
direction
E. There is no induced current in the coil
In the diagram to the right, a metal rod with a
length of L moves at a constant velocity through a
uniform magnetic field of magnitude B. The
magnetic field is perpendicular to the rod. Use this
diagram to answer questions 10 though 12.
10. Which of the following is true about the electric potential in the rod?
A. Point A has higher potential.
B. Point B has higher potential.
C. Point C has higher potential.
D. Point A and B have the same potential.
E. Point A and C have the same potential.
11. What is the potential difference between point A and B?
A. Bv
B. vL
C. BL
D. BLv
E. Potential difference is zero
12. What is the induced electric field in the rod?
A. Bv
B. vL
C. BL
D. BLv
E. There is no electric field in the rod
13. A circular loop of wire is placed in a perpendicular
uniform magnetic field. Which of the following will
not produce an induced current in the loop?
A. Move the loop to region II.
B. Rotate the loop with respect to its diameter.
C. Rotate the loop with respect to its center.
D. Stretch the loop and change its area.
E. None from the above.
14. A steady current, I, flows though a straight wire. A circular loop of wire is
placed next to the wire. Which of the following will not produce an induced
current in the loop?
A. Move the loop away from the wire.
B. Move the loop toward the wire.
C. Increase the electric current in the wire.
D. Decrease the electric current in the wire.
E. Move the loop in parallel to the wire.
15. A current-carrying wire lies on a horizontal table. A circular coil is placed next
to the loop. The current suddenly grows stronger. What is the direction of
the induced current in the coil?
A. Clockwise.
B. Counter-clockwise.
C. There is no induced current in the coil.
D. The induced current changes its direction from clockwise to counterclockwise.
E. The induced current changes its direction from counter-clockwise to clockwise.
16. A current-carrying wire lies on a horizontal table. A circular coil is placed
next to the loop. The current vanishes suddenly. What is the direction of
the induced current in the coil?
A. Clockwise
B. Counter-clockwise
C. There is no induced current in the coil
D. The induced current changes its direction from clockwise to counterclockwise
E. The induced current changes its direction from counter-clockwise to
clockwise
17. A rectangular loop of wire is moved at a constant speed from region I to region II and then to region III.
Which of the following is true about the magnetic force direction acting on the loop when it crosses the
boundary between the regions?
Region I→ Region II
Region II→ Region III
A. Left
Right
B. Left
Left
C. Right
Right
D. Right
Left
E. Zero
Zero
18. Coil A is connected to a circuit including: a battery, a switch, and a resistor. Coil B lies in the same plane
as coil A. What is the direction of the induced current in coil B at the moment when the switch is closed?
A. Clockwise.
B. Counter-clockwise.
C. There is no induced current in the coil.
D. The induced current changes its direction from clockwise to counter-clockwise.
E. The induced current changes its direction from counter-clockwise to clockwise.
Answers
1) B
2) A
3) A
4) B
5) B
6) D
7) B
8) E
9) B
10) A
11) D
12) A
13) C
14) E
15) B
16) A
17) B
18) B